<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
  <style>
        table {
            width: 500px;
            margin: 100px auto;
            border-collapse: collapse;
            text-align: center;
        }
        
        td,
        th {
            border: 1px solid #333;
        }
        
        thead tr {
            height: 40px;
            background-color: #ccc;
        }
    </style>
<body>
    <table cellspacing="0">
        <thead>
            <tr>
                <th>姓名</th>
                <th>科目</th>
                <th>成绩</th>
                <th>操作</th>
            </tr>
        </thead>
        <tbody>

        </tbody>
    </table>
    <script>
        // 1.先准备数据
        var datas = [{
            name: '魏璎珞',
            subject: 'javascript',
            score: 100
        }, {
            name:'wdc',
            subject: 'java',
            score: 90
        }, {
            name: '皇帝',
            subject: 'javascript',
            score: 99
        }];
        // 往tbody里面添加行有几个人创建几行
        var tbody = document.querySelector('tbody');
        for(var i = 0; i < datas.length; i++) {
            //创建行
            var tr = document.createElement('tr');
            tbody.appendChild(tr);
            // 往行内创建单元格
            for(var k in datas[i]) {
                var td = document.createElement('td');
                // 将对象里的属性值datas[i][k]给td
                td.innerHTML = datas[i][k];
                tr.appendChild(td);
            }
            // 3.创建有删除两个字的单元格
            var td = document.createElement('td');
            td.innerHTML = '<a href="javascript:;">删除</a>';
            tr.appendChild(td);
        }
            var as = document.querySelectorAll('a');
            for(var i = 0; i < as.length; i++) {
                as[i].onclick = function() {
                    tbody.removeChild(this.parentNode.parentNode);
                }
            }
    </script>
</body>
</html>